Planer-dog.



m. 890,544. PATENTED JUNE 9, 1908. A. W.WHITO0MB.

PLANEB. DOG.

APPLICATION FILED MAY 22. 1906.

2 SHEETS-SHEET 1.

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2 SHEETS-SHEET 2.

PATENTED JUNE 9, 1908.

A. W. WHITGOMB.

PLANER DOG.

APPLICATION FILED MAY 22. 1905.

ALONZO W. WHITOOMB, OF WORCESTER, MASSACHUSETTS.

PLANER-DOG.

Specification of Letters Patent.

Patented June 9, 1908.

Application filed May 22, 1905. Serial No. 261,522.

To all whom it may concern:

Be it known that I, ALoNzo W. WHIT- COMB, a citizen of the United States, residing at Worcester, in the county of Worcester and State of Massachusetts, have invented a new and useful Planer-Dog, of which the following is a specification.

This invention relates to the adjustable stops forming the abutments for reversing the travel of planer tables.

The especial object of this invention is to provide a self-clamping dog which can be moved freely forward in one direction; which will clamp itself firmly in place against motion in the opposite direction; and which may be moved or set to different positions without the use of wrenches or other tools.

To these ends, this invention consists of the planer-dogv as an article of manufacture, and of the combinations of parts therewith as hereinafter described and more particularly pointed out in the claims at the end of this specification.

In the accompanying two sheets of drawings, Figure 1 is a side view partly broken away of sufiicient parts of a metal planing machine to illustrate the application of this invention thereto. Fig. 2 is a plan view partly broken away of a planer dog constructed according to this invention. Fig. 3 is a detail view of the swinging connection which joins the block and clamp-piece ofa planer-dog constructed according to this invention. Fig. 4 is a front view of the device. Fig. 5 is an end view thereof, and Fig. 6 is a perspective view of the connections for releasing the clamp-piece In that class of machine tools to which this invention relates, the planer-table carries the work back and forth under cutting tools clamped in position to the cross-beam.

In order to reverse the driving connections, and in order that the length of stroke of the planer table may be adjusted, it is now the practice to use planer-dogs which are adjustably bolted to the sides of the planer-table. When these dogs are to be shifted or set to different positions it has heretofore ordinarily required a wrench or other special tools for such adjustments, and, in some cases, when the planer dog is not firmly tightened or clamped in place it will slip back, permitting the planer-table to have longer travels than desired.

A planer dog constructed according to this invention has been especially designed with a view of providing a self-clamping construction which can be set up or moved in one direction, but which will clamp itself firmly against motion in the opposite direction, so that there is no danger of the same working loose, and being moved back. The construction is also provided with releasing connnections so that the device can be loosened and readily shifted to different positions without the use of special tools.

Referring to the drawings for a detail description of an ap aratus embodying this invention, Fig. 1 i ustrates the way planerdogs constructed according to this invention are applied to an ordinary metal planer. As shown in this figure, A designates the bed casting of the planer; B the frames; 0 the cross-beam on which are mounted the usual planer-heads D for carrying the laningtools. The tool-feed is accomplished in any ordinary way; for example, by the usual feed mechanism F. Power is applied to the machine through the driving shaft G. Cooperating with the pulleys on the driving shaft G is a belt-shifter H. The table T is provided along its edge with the usual T-slot S, in which the planer dogs are fastened. Two planer-dogs are employed, and engage alternately with a rocl -arm R controlling suitable connections for reversing the' travel of the planer bed in the well-known manner which need not be herein described at length.

The parts as thus far referred to may be of any of the ordinary or approved constructions, and need not be herein described at length.

The preferred form of self-clamping dog is most clearly illustrated in the second sheet of drawings. As shown in Fig. 4, each of these dogs comprises a block 10 having a fixed piece or handle 11. Extending rearwardly from the block 10 as shown in Fig. 2, are stop-pieces 12 and 13. Mounted between the stop pieces 12 and 13 is a clamIp-piece 14, and fitting into recesses in the c amp-piece 14 and the stop-piece 12 is a spring 15 which normally tends to move the clamp-piece 14 so that it will wedge itself in place in the T- slot of the planer-table. In order to secure this clamping action the clamp-piece 14 is connected with the block 10 by a swinging connection, pivoted to the block and disosed at an angular position so that any iorcefitending to move the clamping piece responding socket shown in Fig. 6.

relative to the block in one direction, will act against the swinging connection which will tend to draw the piece 14 toward the block and clamp the parts together against the walls of the T-slot. As shown in Fig. 3, this swinging connection comprises a bolt 16 having a rounded head fitting into a corresponding socket in the block 10, and a nut or socket portion threaded ontothe bolt 16, and having a rounded head fitting into a corin the clamp-piece 14. The swinging connection constitutes adjustable means for limiting the motion of the clamp-piece. By means of this construction, a pressure on the block tending to push back the construction away from the rock-arm cooperating therewith will tend to tighten the swinging connection between the block and the clamp-piece, and this self-tightening clamping action will prevent the dog from working loose or being forced back from the position from which the same is adjusted. At the same time, the construction is free to be moved in the op osite direction, because by pushing the bloc; forward, the swinging connection will tend to loosen the clam piece so as to leave the device free to e moved forward to any desired extent.

To release the clamping action so that the dog can be moved back and forth, or adjusted and set to any desired position, I preferably employ the releasing connections As shown in this figure, the block is provided with a rock-shaft 18 carrying a lever 19. At its rear end, the rock-shaft 18 has a yoke 20 for engaging a pin or stud 21 extending from the clamppiece. By turning the releasing lever 19, the clamp-piece can be moved back against the tension of its spring, so that it will be released, and the dog can be moved and set to any desired position on the side of the planer-table.

I am aware that changes maybe made in the details of the construction of my planerdog by those who are skilled in the art, without departing from the scope of my invention as expressed in the claims.

I do not wish, therefore, to be limited to the device I have herein shown and described, but

What I do claim and desire to secure by Letters Patent of the United States is:

1. In a self-clamping dog, the combination of a block, a clamp-piece adapted to slide in a slot, and a connection between the block and clamp-piece swinging about an axis near one of its ends and serving to hold the block and clamp-piece together, and to so clamp the clamp-piece as to hold the dog against motion in one direction.

2. In a self-clamping dog, tion of a block, a clamp-piece, a separate connection between the block and clamppiece swinging about an axis near one of its the oombina-- ends, and aspring acting on the clamp-piece,

whereby the swinging connection will tighten the clamp-piece to clamp the same against motion in one direction.

3. In a self-clamping dog for metal planers, the combination of a block, a clamp-piece fitting a slot in the planer table, a swinging connection between the block and clamp piece comprising a round-headed nut fitting a corresponding socket in one of said pieces, and a round-headed bolt fitting a corresponding socket in the other of said pieces, and a spring normally tending to tighten the clamp-piece.

4.. In a self-clamping dog, the combination of a block, a clamp-p1ece, a connection between the block and clamp-piece adapted to swing on an axis near its end opposite the clamp-piece, a spring normally tending to hold the clamp-piece so that the swinging connection will clamp the parts against motion in one direction, and a releasing handle to move the clamp-piece back against the tension of its spring.

5. In a self-clamping dog for metal planers, the combination of a block, a clamp-piece fitting a slot in the planer table, a swinging connection between the block and clamppiece comprising a round-headed bolt fitting a corresponding socket in one of said parts, a round-headed nut fitting a corresponding socket in the other of said parts, a spring normally tending to move the clamp-piece so that the swinging connection will clamp the parts against motion in one direction, a rock-shaft mounted in the block, a releasing handle, and an operating-fork secured on the opposite ends of the rock-shaft respectively for releasing the clamp-piece when the dog is to be adjusted.

6. In a self-clamping dog for planers and the like, the combination of a block, a clamp piece slidably connected therewith for entering a slot in the planer table or the like, and an angularly disposed swinging connection between the clamp piece and block.

7. In a self-clamping dog for planers and the like, the combination of a block, a clamp piece slidably connected therewith for entering a slot in the planer table'or the like, an angularly disposed swinging connection between the clamp piece and block, and a releasing handle for loosening the clamp piece for adjusting the dog.

8. In a self-clamping dog for planer-s and the like, the combination of a block, a clamp piece slidably connected therewith for entering a slot in the planer table or the like, an angularly disposed swinging connection between the clamp piece and block, a releasing handle for loosening the clamp piece for adjusting the dog, and a spring tending to force the clamp piece in such direction along the 9. A self-clamping dog for planers and the like having a slidably mounted clamp piece, and a swinging connection engaging the clamp piece, said connection being angularly disposed with respect to the motion of the clamp piece.

10. A self-clamping dog, mounted clamp-piece and nection for engaging the holding it against a surface of the dog, said connection being adjustable along a line connecting the center about which it swings and the clamp-piece, and being angularly disposed with respect to the motion of the clamp-piece.

11. A self-clamping dog having a clamppiece, means for moving said clamp-piece in one direction, adjustable means for limiting its motion in the same direction, and a releasing lever for loosening the clamp piece, said lever being separate from the clamp piece and adjustable means.

12. A self-clamping dog having a clamppiece, means for moving said clamp-piecein one direction, adjustable means for limiting its motion in the same direction, said adjustable means comprising a connection swinging on an axis at an angle to the direction of mohaving a slidably a swinging conclamp-p1ece and tion of said clamp-piece, and a releasing lever for loosening the clamp piece.

13. A self-clamping dog having a clamp piece, means for moving said clamp-piece rectilineally in one direction, and an adjustable connection swinging on an axis at right angles to the direction of motion of said clamp-piece and at a distance from said clamp piece for limiting the motion thereof in the direction in which it is moved by said means for moving the clamp-piece.

14. A self-clamping dog having a clamppiece, means for moving said clamppiece in one direction, and adjustable means for limiting its motion in the same direction, said adjustable means comprising a connection swinging on an axis located at its end and outside of the path of motion of said clamppiece.

In testimony whereof I have hereunto set my hand, in the presence of. two subscribing witnesses.

ALONIZO W. WHITCOMB. 

